beam analysis

Hi guys, I've done some simple analysis for simple steel beam.
Below some screen-shots:
boundary conditions:

mesh:

displace results:

stress results:

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and comm file:
dl.dropbox.com/u/15132791/CAELinux/beam/2xhebSI.comm

I hope I didn't make big mistake in my simple analysis

Now i want to do some more advance analysis of this beam with contact surfaces and nonlinear material properties.

Below screens from model:
views:

contact surfaces:

boundary conditions:

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Can You help or show me similar analysis with Code_Aster (with contact surface or nonlinear material properties).
Best Regards,
Chris
P.S. Sorry for my poor English <br /><br />Post edited by: Chris, at: 2011/10/03 01:15